As others have said, on the first clean with WFP, take your time, especially if the frames are in need of painting or are badly (or even lightly!) Oxidised.
Work your esy across the tops, vents included but beware getting too much water up inside them or you'll end out with runs or worse on the insides!
On whatever side of the house you start, do all of the top windows on that side (or more than one side if it doesn't involve too much faffing about with hoses).
Then go back to where you started and concentrate on the glass and although I am not one for separate rinsing off the glass, this is one occasion where I would most certainly do so.
A first clean, even if it is one of your own existing accounts that you are changing over from traditional to WFP, make sure you spend lots of extra time on that first clean.
On repeat cleans, Georgian windows are an absolute doddle compared to using traditional methods and sooo much faster you will need to beware under pricing similar new accounts!
Pricing tip:
Always price as you would for traditional work and you won't go far wrong
